PHP Unconference Europe 2015

Imagick::getQuantumDepth

(PECL imagick 2.0.0)

Imagick::getQuantumDepthLit la profondeur quantique

Description

array Imagick::getQuantumDepth ( void )
Avertissement

Cette fonction n'est pas documentée et seule la liste des arguments est disponible.

Retourne la profondeur quantique, sous forme de chaîne.

Valeurs de retour

Retourne la profondeur quantique, sous forme de chaîne.

Erreurs / Exceptions

Lance une exception ImagickException si une erreur survient.

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holdoffhunger at gmail dot com
2 years ago
The getQuantumDepth works much like the other "Depth" functions and much like the getQuantumRange function.  Like the Depth functions, it returns a value indicating the number of bits to store the unique color values -- 16-bit = 2^16 unique colors, which is 65,535 (counting starts at '0' in binary, as opposed to '1' in decimal).  Like the getQuantumRange function, it returns an array with two values, one being a long integer ('quantumDepthLong') and the other being a string ('quantumDepthLong').  The only difference, besides the variable types, is that the string version has a 'Q' prefixed to it.

Here's some sample code and the results, given a color, BMP file photograph that is 600x450 pixels...

<?php

           
// Author: holdoffhunger@gmail.com
   
        // Imagick Type
        // ---------------------------------------------

   
$imagick_type = new Imagick();
   
       
// Open File
        // ---------------------------------------------
       
   
$file_to_grab = "image_workshop_directory/test.bmp";
   
   
$file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
   
       
// Grab File
        // ---------------------------------------------

   
$imagick_type->readImageFile($file_handle_for_viewing_image_file);
   
       
// Get Quantum Depth
        // ---------------------------------------------
       
   
$imagick_type_quantum_depth = $imagick_type->getQuantumDepth();
   
       
// Print Results
        // ---------------------------------------------

   
print("<pre>");
   
print_r($imagick_type_quantum_depth);
    print(
"</pre>");

?>

Output:

Array
(
    [quantumDepthLong] => 16
    [quantumDepthString] => Q16
)
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